[Diy_efi] PW Controlled Sequential Water Injection - It RUNS!

[Daniel R. Nicoson]

It ran.  I'm happy and celebrating with a bowl of vanilla ice cream & Oreo
cookies and a Mt Dew.

I ran it tonight for about 15 minutes, only a few leaks to fix and a
pressure gauge to wire up Saturday AM.  Hopefully dyno time over the
weekend.  I can't claim any blazing performance improvement based on
tonight's run.  I still have to load the appropriate tune into the EEC to
take advantage of the system.  The EEC Tuner list was helping me with that
tune today.

What is it?
8 separate 14# injectors with their own "water feed rail", water pressure
regulator referenced to intake vacuum (actually a 1994 Mustang 5.0 fuel
regulator), a 6 gallon supply tank in the trunk with a Sureflo diaphragm
pump.  Water flows up to the feed rail through your basic 300 psi air
compressor hose and the return flow through the same.  I built an analog
controller that is triggered by the respective fuel injector pulse width,
the water injector is delayed a set amount of time and then fires for the
remainder of the pulse width.  This delay is adjustable giving me the
ability to change the percentage of water injected.  I have 30# fuel
injectors.  I also use the EEC Tuner which gives me full control over my
fuel tables and spark tables.  The injector drivers are proper P & H if I
ever need to run lo impedance injectors.  Right now just running Crown Vic
14# high impedance injectors.

What's it supposed to do on a NA 1994 5.0 Mustang?

Two things, provide detonation resistance at WOT (two T-3 turbos waiting for
an install...) and POSSIBLY improve highway cruise mpg.

Theory:

WOT operation you guys all know.  Cooler intake charge; also water replaces
the extra fuel normally used to cool the cylinder during the combustion
event.  I'll be experimenting with pretty lean mixtures at WOT (13:1 even
14:1 AFR).

Highway cruise. Based on some WWII research reports - they were running up
to 50 parts water to 100 parts fuel at high load, achieving great power
gains AND achieving about 10% improvement in efficiency.  My thoughts were
that 50% water at low LOADs probably would be too much but if I built the
controller with some adjustability I could EXPERIMENT and see if a lesser
amount of water would help at highway cruise.

Most of the ideas I used were from you guys on these lists.  A lot of people
from various lists have contributed.  I think we started discussing pulse
width controlled sequential water injection back in July 2003.  I've been
working on it ever since.  I had to learn all about the electronics and
spent most of this 15 months getting all that working right.  My wife jokes
that I could open a Radio Shack store with everything it took to finalize
the circuit (most of it came from Mouser and Digi Key).  The fabrication to
mount the extra injectors under my Trick Flow manifold took over a month.
The feed rail is welded stainless steel (Dustin where I work is a wizard
welder!).  The wiring harness in the car was a LOT of work.

This is an EXPERIMENT!  Eventually I will write all this up, post some
circuit diagrams etc.  Right now I have about 30 days before the snow shuts
me down, I want to get some data during that time.  I am also concerned how
long the injectors will last.  I ran straight water tonight.  After the
leaks are all resolved, I plan to run 80% water & 20% methanol that has 1 oz
of Klotz - Uplon fuel lube per gallon of methanol.  The Klotz is supposed to
provide upper cylinder lube for alcohol fueled vehicles AND provide rust
protection for the fuel system.  My only corrosion concerns are the
injectors, pressure regulator and pressure sensor.  Everything else is
stainless, rubber or plastic (boat fuel tank).

Its an EXPERIMENT, I'm having fun!  Worst part is I'll be traveling for work
the next two days and won't get back to the project until Saturday AM.

Fire away!

Dan

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